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Effect of Pre Harvest Application of Some Growth Regulators on the Yield and Quality Characteristics of Grape (vitis Vinifera L.)

S. Begum
BCSIR Laboratories, Binodpur Bazar, Rajshahi-6206, Bangladesh.

M. Ibrahim
BCSIR Laboratories, Binodpur Bazar, Rajshahi-6206, Bangladesh.

A. Samad
BCSIR Laboratories, Binodpur Bazar, Rajshahi-6206, Bangladesh.

M.R. Khan
BCSIR Laboratories, Binodpur Bazar, Rajshahi-6206, Bangladesh.

S.Khaleda
BCSIR Laboratories, Binodpur Bazar, Rajshahi-6206, Bangladesh.

A.K.M.S.Alam
BCSIR Laboratories, Binodpur Bazar, Rajshahi-6206, Bangladesh.

A.N. Chowdhury
BCSIR Laboratories, Binodpur Bazar, Rajshahi-6206, Bangladesh.

Abstract/ Executive Summary:

Present study was undertaken to investigate the relative efficacy of four growth regulators, viz., α-naphthalene acetic acid (NAA), indole-3-acetic acid (IAA), gibberellic acid (GA) and 2,4-Dichlorophenoxy acetic acid (2,4-D) at various concentrations (ppm) on the yield and some other quality characteristics of grape (Zakkao cultivar) at the experimental grape research vine of BCSIR Laboratories, Rajshahi during the period January, 2003 to July, 2004. Yield was found to be increased (33.11%) by spraying with 05 ppm of 2,4-D as compared to control and other growth regulator treatments. Fruits of treated plants showed increased total soluble solids (20.28%) and vitamin (23.18%) than that of untreated one. The titrable acidity (T. A) of fruits (33.01%) of the treated plants was reduced significantly as compared to control.

Keywords: Pre Harvest application, Growth regulators, Yield and quality, Grape

Location: At the experimental grape research vine and chemical analyses of fruits were carried out at the Laboratory, BCSIR Laboratories, Binodpur Bazar, Rajshahi.

Start Date: 00-01-2003

End Date: 00-07-2004

Program Area: Crop-Soil-Water Management

Commodity: Grape

Objectives:

To investigate the effect of four growth regulators on the yield and quality characteristics of grape under the climatic condition of Rajshahi.

Methodology:

The field experiment was conducted at the experimental grape research vine and chemical analyses of fruits were carried out at the Laboratory. The experiment was carried out from January 2003 to July 2004. Four years old 40 grape plants of Zakkao cultivar were selected, three plants serving a block. The experimental plants were designed and marked properly. The plants were sprayed with 25(T₁), 50(T₂), 75(T₃) ppm of gibberellic acid (GA); 20(T₄), 40(T₅), 60(T₆)ppm of indole-3-acetic acid (IAA); 20(T₇), 40(T₈), 60(T₉) ppm of α-naphthalene acetic acid (NAA) and 05(T₁₀), 10(T₁₁) 15(T₁₂)ppm of 2, 4-diclorophenoxy acetic acid (2, 4-D). The control plant (T₀₎ was sprayed with water in identical condition. Every time spray was done on sunny days. The experimental plants were first sprayed after berry set, when the fruits became pea size. The 1st spray was applied on 15 April, 2004. The 2nd, 3rd, 4th and 5th were done on 30 April, 15 May, 30 May and 15 June, 2004, respectively. The spray was done at pit hardening stage between 12.00 noon to 3.00 pm. Manure and fertilizers were applied as per standard doses and method (Fertilizer Recommendation Guide, 1997). Cultural practices were done as and when necessary. Fruits from the treated and control plants were collected at an interval of 15 days from each spray and were analyzed for different quality characters. Whole weight of the fruit was taken by weighing method. The quality characters analyzed were total soluble solids, acidity, and vitamin C. Total soluble solids was determined by refractometric method (Gofur et. al., 1998). Acidity was determined by the acid-base titrimetric method (Ranganna, 1986) using standard sodium hydroxide solution. Vitamin C content was estimated by the titrimetric method (Mahadevan and Sridhar, 1982) using 2, 6 dichlorophenol indophenol indicator. Organoleptic tests (test for taste) were conducted for the treated and control fruits by a test panel consisting of five member of scientists to determine the quality and acceptability of the fruits and were classified as follows on the basis of grading made by test panel: excellent = 80 % or above, good = 70 - 79 % and fair = less than 70 % considering appearance, colour, flavour, taste and texture. The recorded data were statistically analysed and the means of different parameters were compared by least significant difference (LSD) test.

Source of Information: Bangladesh J. Sci. Ind. Res. 42(1), 59-66, 2007

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Yield was found to be increased (33.11%) by spraying with 05 ppm of 2,4-D as compared to control and other growth regulator treatments. Fruits of treated plants showed increased total soluble solids (20.28%) and vitamin (23.18%) than that of untreated one. The titrable acidity (T. A) of fruits (33.01%) of the treated plants was reduced significantly as compared to control.

Knowledge Management: Journal